X p pulsator



Aug. 14, 1928. LGSLMS J. A. SCHMITT PULSATOR Filed Feb. 25. 153221L i Z5 J /Z Z4 'mm-G;

Patented Aug. 14, 1928.

y UNITED sTnTesN JOHN A. SGHMITT, 0F CULU'MBUS, GEK),

Para 'r Fries.

lll@ THF UNIVERSAL MJLKING MACHINE COMPANY, OF WAUKESHA, WlSCONSlN, A CURPRATION UF WISCONSN.

FULSATOR.

Application iled February 25, 1922.

issued Feb. 28, 1922, and No. 1,647,9'l, issued November 1, 1927.

The object of the invention is 4to simplify the structure as well as the means and mode of operation of pulsators, or alternating d evices, whereby they will not only be cheapcned in construction, but will be positive in operation., uniform in action and unlikely to get out of repair.

A. further object of the invention is to provide a small compact structure, havinfr an improved method of controllingr the valve mechanism, the tumbler mechanism for the control valve beingr actuated by the movement of the pulsator valve.

llVith the above primary and other incidental objects in view as will more fully appear in. the specification, the invention consists of the features of construction, the parts and combinations thereof and the inode of operation or their equivalents as hereinafter described and set forth in the claims.

In the accompanying drawing, wherein is shown the preferred, but obviously not necessarily the only form of embodiment of the invention, Fig. 1 is a top plan view and Fig. 2 a side elevation of the assembled pulsator or alternator forming the subject inatter hereof. Fig. 3 is a top plan view partly in section of themain structure with the valve mechanism removed. Fig. 4 is a vertical sectional view of the main structure shown in Fig. 3. Fig. 5 is a perspective view of the reciprocatory pulsator valve viewed from the under side. Fig. 6 is a bottom plan view of the alternating valve mechanism. Figs. 7 and 8 are detail sectional. views, illustrating the interconnection of the valved ports.

Like parts are indicated by similar characters of reference throughout the several views.

The structure herein shown is particularly adapted for beingmounted upon the lid or cover of a pail or receiver, which will form the closure of the bottom vacuum chamber contained in the base of the structure. Otherwise the pulsator is mounted upon a suitable base, not shown, in lieu of such pail Serial lilo. {i3-film.

or receiver lid. ln the particular form of embodiment illustri-ated, the pulsator comprises a vertically disposed cylindrical chambered base 4l, carryingat one side thereof a laterally disposed integral short cylinder portion 5, and adjacent to this cylinder 5 and forming; the top of the base 4 or vacuum chamber is a flat table like valve bearing surface G. Upon this bearing surface or valve table 6.` the pulsator and control valve are in'eferubly mounted.. The vacuum cham` ber i within the buse Ll is provided with a nipple or spud 8, through which it communicates with any source of suction such as avacuum tank a pump or other such device. rlfhe head of the base f limmediately bencath the valve bearing' surface is provided vvith a transverse bore 9, communicating with the interior of the cylinder 5, and within which bore reciprocates a piston stem 10, connected within the cylinder 5 to a piston head. ',lhe" piston head is actuated to and fro by alternation of atmospheric pressure on opposite sides thereof. It comprises two oppositely disposed tapered discs l1, between which is disposed an annular collar or rinp; l2 of packing' material, such as leather, rubber, composition or other suit-` By relative adjustment of able substance. the tapered disc 1l by means of a clamp nut 13, upon the entremity of the piston rod,-

the annular packing' l2 may be `subjected to greater or less compression and so expanded into engagement with the Walls of the cylinder 5.

rlhe piston is actuated to and fro by alternately connectingr the opposite sides of the piston with atmosphere and with the suction or vacuum chamber Y respectively. To this end the valve table 6 is provided with a group ofthree ports, 17, 18 and 19. The intermediate port 17 entends downwardly through the head or top of the pulsator body and communicates at its lower end with the cylinder 5 and beyond the piston head.

11 I hese ports are controlled by an. oscillatory control valve 20, pivotally mounted upon a n stud 21, and oscillated to and fro to alternately connect the suction port 17 with the respective ports 18 and 19. The disconnected port being uncovered by the movement of the valve 2O admits air at atmospheric pressure to the cylinder. At the same time, the opposite end of the cylinder is connected through the corresponding passage and port with the vacuum chamber 7. As a result the atmospheric pressure upon the piston head Will shift the piston toward the end of the cylinder connected with the suction'or vacuum chamber. This movement of the piston is transmitted to the valve 20 `to reverse the position of the valve and the communication of the ports controlled thereby to admit air pressure to the opposite side of the piston 10 and reversing the connection of the cylinder 5 With the suction or vacuum chamber 7. Adjacent to the opposite side of the valve table 6 is a second group of ports 23, 24 and 25, constituting the pulsator ports and controlled by the reciprocat-ory pulsator valve 26. The intermediate port 23 conivmunieates With the vacuum chamber 7, While the ports and 26 are independently connected with a separate teat cup connection in this instance a Y -connection 27. The teat Ycup clusters are connected ivith the connections 27, and alternately actuated as the valve 26 is reciprocated.

The pulsator valve 26 is recessed on its under side at 26 to afford an intercommunieating passage between the intermediate port 23 and the respective ports 24 and 25 when the valve is at the opposite limit of its stroke. At one limit of its movement the valve 26 connected the ports 23 and 2-/1 leaving the port 25 open to atmosphere While at its opposite stroke this connection is reversed, opening the port 24 to atmosphere and connecting` the port 25 With the source of suction through the port 23.

The valve 26 is slotted or splined on its under side as at 28 for engagement over a feather or gib 29, projecting from the top surface of the valve table 6. This guide feather or gib 29 may be integral with the pulsator body, or may be separately formed and secured thereto. The table top 6 is finished with a uniform smoothV surface over Which the control and pulsator valve plays. The bearing surfaces of the valves upon the table are such as to form hermetically sealed -contacts excluding atmospheric air.

1n the table surface 6 there is formed a slot 6a communicating vvith the bore l9. The piston stem 10. extending Within the bore 9 carries a stud 10a, which projects above the 'face of the valve table 6, through said slot 6a, and engages a socket or hole 26a in the under side of the reciprocatory pulsator valve 26. The valve 26 thus rests loosely upon the bearing or table surface 6, and is v pressed thereon by atmospheric pressure, the

underside of the valve, particularly the rccess 26 being subjected te suction or vacuum. Thus atmosphere forms a preponderance of pressure upon the top of valve holding it to its bearing` upon the surace 6. rl`he saine is true of the control valve 20, which likewise is subjected to suction or vacuum on its under side through the port 17, While atmosphere affords a preponderance of pressure upon the top. being connected with the piston 10 thru the stud 10n and piston stein 10, reciprocate.:y in unison With the piston and alternates the connection of the teat cup spuds 27 ivith the suction or vacuum chamber 7. This movement of the pulsator valve alternately subjects each of the teat cup spuds 27 to admission of air at atmospheric pr ure and to exhaust througggh connection vrnh the vacuum chamber 7.

This te and fro movement of the pulsa-tor valve is transmitted to the control valve 20 to affect its alternation as the pulsatm' valve and With it the piston 1() approach the limit of their movement in either direction. 'the alternation of the control valve 2() in (urn admits actuating fluid i.. e. air at atniof-pheric pressure, alternately to opposite sides of the piston head. In the present n tance the construction is such that the control valve 2() is automatically locked in its operated position until the pulsator valve and ph on approach the opposite limits of their stroke whereupon the control valve is not only unlocked, but is actuated with a, snap over movementto its reverse position.

To this end, there is pivoted upon the table 6 an oscillatory actuating head 30, having in one side thereof two intersecting arcuate faces 3l-31. This actuating head 3() is provided with a dependent pin or stud 32, which enga-ges in a bifrucation 32 in the oscillatory control valve 20. By the to and fro oscillation of the actuating head 30, about its pivotal stud 3l, the control valve 2O is oscillated in unison to cover and uncover the ports 1S and 19 alternately. Plvoted upon the table 6 intermediate head and reciprocatory pulsator f'alve 26 upon a pivotal stud 35 is an oscillatory locking arm 36. This locking arm 36 is provided With a stop nose 37, vwhich engages alternately in the respective arcuate aces 31 of the head 30, according to the position of the head. These arcuate faces 31 of the actuating head 3() are so arranged as to be concentric with the pivotal stud 35 of the locking lever, when the head 30 is at the opposite limit of its oscillatory movement. That is to say, when the head 30 is turned in one direction, one of these arcuate faces 31 Will be positioned concentric with the pivotal stud 35, and in position to he uniformly emraged by the locking` nose 37 of the lever 36'. Upon reversal of the actuating The pulsator valve 26 4H their stroke.

is connected at one end to a stud or other connection 4,@1, at the free end of the locking lever 86, and connected at its opposite end eccentrically With the head 30. In the pres ""ent instance this eccentric connection of the head 30 has been shown as by means of a Wire bail 42, Which is bent laterally to form an offset connection for the spring and afford the necessary leverage for oscillating,` the actuating head. Any suitable connection may be employed as an arm or finger eiroscillated in unison to afford a Winding' movement of the locking,` nose 37 Within the concentrically positioned arcuate face 31. The engagement of the nose 57 Within such arcuate face serves to hold the head 30 against oscillation under the influence of the spring' 40 after said spring1 has passed a dead center position in the movement of the lever, until the locking nose 37 has passed out of the particular arcuate face or beyond the juncture of the two faces 31.`

The parts are so proportioned that this lock ing nose Will pass this juncture angle of the arcuate faces 3l only as the piston and pulsator valve 26 `approach the limit of At this time the movement of the locking lever 36 has Vplaced the spring` under tension and the spring, will in turn be exerting a pulling inliuence upon the laterally disposed ivire bail or lever 12. i The retraction of the spring 40 as the nose 37 passes beyond the juncture angle of the faces 31 serves to oscillate the heal 8() and through the interconnection of its dependent pin or stud 32 Within the bifurcation 33 oi2 5l* the control valve, it `oscillates the control valve 20 about its stud 21, thereby reversiiic` 'nba the atmospheric and `suction influences upon the piston and the parts benin their travel in t-he opposite direction. Upon approachff ing the limit of stroke in the reverse direction the same cycle of operation is repeated. Thus the movement of the lever 36 to and fro past a dead center position, in relation With the center of oscillation of the actuating head 30, tensions the spring l0 to actu- 5 juncture angle of the faces 31. The speed with Which the alternation or reversal oc-A curs is controlled by regulating the capacity of the control port 17. To this end there is provided an adjusting screiv 43 Which intersects the port passage and by its adjustment serves to reduce the capacity of the port and hence the volume of air passing therethrough and so retards the speed of parution. The entire tumbler mechanism and valve may be enclosed Within a suitable cap or housing which may be mounted upon the top off the structure shown.

From the above description it Will be apparent that there is thus provided a device of the character described possessing the particular ifeatures of advantage before enumerated as desirable., but Which obviously is susceptible oi2 modification in its form, proportions, detail construction and arrange ment of parts Without departing from the principle involved or sacrificing1 any of its advantages.

While in order to comply with the statute the invention has been described in language more or less specific as to structural. features, it is to be understood that the invention is not limited to the specific details shown, but that the means and construction herein disclosed comprises the perferred form of several modes of putting the in vention into eflect and the invention is there fore claimed in any of its forms or modifications vvithin the legitimate and valid scope of the appended claims.

Having thus described my invention, l claim:

1. In a snap over mechanism ot the chai'- acter described, the combination 'ith body having ports to be alternately opened and closed, of a movable valve member controlling said ports, an oscillatory actuator head mounted independent of said valve, having intersecting` arcuate faces, and an operative connection With the port control valve, an oscillatory stop member having' wiping engagement vvitlithe arcuate faces of said actuator head, said arcuate faces being1 alternately brought into concentric relation with the pivotal Iconnection of the oscillatory stop member, said stop member locking the actuator head against reversal until the stop member has moved through a prescribed limit of travel and means for actuating the stop member and means to reverse said head when released by said stop member.

2. The combination with fluid pressure operated pulsator mechanism, of a pivoted control. valve governing the action of the fluid pressure upon said mechanism, tumbler mechanism for automatically reversing said valve, including an oscillatory head eccentrically pivoted in relation with the pivotal mounting` of the valve, but operatively connected vvith the valve and having tvvo intersecting arcuate faces, an oscillatory vstop member With the pivotal connection of Which the arcuate faces are concentrically positioned alternately, means tor periodically oscillating said actuating head and means Jfor actuating the stop member to release said head for periodic oscillation by which the control valve will be simultaneously osc`llated.

3. The combination with fluid pressure operated pulsator mechanism, of a movable valve member, an oscillatory actuator head pivoted independent of, but operatively connected With the movable valve, a pivoted stop member, two arcuate faces on said head alternately moved into concentric relation with the pivot of said stop member by the rcversal ot said head, means tor periodically reversing said head and with it the valve and means for actuating the stop member to release the head for such reversal.

4. ln a construction ot' the character dcscribed, a movable valve member, an oscillatory stop member, and a separately pivoted actuator head operatively connected With said valve and having thereon tvvo arcuate taces engaged alternately by said stop member, and alternately positioned concentric With the center of oscillation ot the stop member by the pivotal movement oit the head, means for periodically reversing said head, and means for actuatingthe stop to disengage it from one arcuate tace to permit the movement of the head which brings the other arcuate face to position to be engaged.

5. ylhe combination With a fluid pressure operated pulsator mechanism, ot an inter- Amittently movable control valve governing the action of the fluid pressure, a movable pulsator valve actuated by the pulsator mech` anism, an operative' connection for transmitting motion from the pulsator valve to said control valve and an oscillatory stop member actuated by and movable to and fro about a pivotal center in unison with the movement of the pulsator valve for releasably holding` the control valve against movement until the pulsator valve has reached the limit of its travel.

6. In a construction of the cha y'acter described, a liuid pressure operated piston, a pulsator valve directly connected with the piston tor movement therewith, a movable control valve governing the action ot the fluid pressure upon Said piston, a spring energized by the movement ot the pulsator valve to actuate the. control valve and a governor therefor comprising an oscillatory head pivoted for movement through a. path of travel different from that ot the vulve having two arcuate faces and an oscillatory .stop member alternately engaging said :facevi vvith the pivotal connection of which the arcuate races are alternately concentrically positioned by the oscillation or the head, an operative engagement between said head and control valve and an operative comico tion betvvcen said stop member and the pulsator valve.

l'. ln construction ol' the cliara xter dcscribed, a fluid pressure operated piston, a valve governing the action ot the iluid pressu e upon the gisten, an of-acillatory control l. d mounted independent oli said valve but o )erativcly connected therewith, a n'iovable stop member alternately holding` the control head in different positions oit adjusment, :leans ttor periodically reversing said head and means ior actuating the stop member to release said head for reversal.

8. ln a iuid pressure operated pulr-iator mechanism, a travelling pulsator valve, means for controlling the action ot the V[luid under pressure to effect rcciprocatory reversal ot direction ot movement ot the valve at opposite limits of its strol; pivoted stop member having operative connection with the pulsator valve for oscillatorVT actuation thereby, ann au oscillatory member having tivo arcuate faces alternately positioned concentric with the center of oscillation ot the pivoted stop member within which arcuate laces the stop member performs a sweeping movement While holding` the oscillatory member against reversal until the stop member passes beyond the limit ot the csgaged arcuate face, and means tor oscillating said member having the arcuate faces to etl'ect a reversal ot the action of the fluid pressure upon the pulsator valve.

9. A fluid pressure operated pulsulor mechanism including a rcciprocatory pulsator valve, an oscillatory control valve governing the action ot the fluid under pressure, to reciprocate the pulsator valve, an oscillatory stop lever actuated to and tro by the movement ot pulsator valve and preventing the movement of the control valve until the pulsator valve roaches the limit olf its stroke.

In testimony whereof, I have hereunto set my hand this 21st day of February A. D.

JOHN A. SGHMlT'l. 

